#include <rclcpp/rclcpp.hpp>

class TestNode : public rclcpp::Node {
public:
  TestNode() : Node("test_node") {
    RCLCPP_INFO(this->get_logger(), "Hello, world!");
  }
};

int main(int argc, char *argv[]) {
  rclcpp::init(argc, argv);
  rclcpp::spin(std::make_shared<rclcpp::Node>("test_node"));
  rclcpp::shutdown();
  return 0;
}